struct lp_build_tgsi_context * bld_base,
struct lp_build_emit_data * emit_data);
-static bool tgsi_is_shadow_sampler(unsigned target)
+static bool tgsi_is_array_sampler(unsigned target)
{
- return target == TGSI_TEXTURE_SHADOW1D ||
+ return target == TGSI_TEXTURE_1D_ARRAY ||
target == TGSI_TEXTURE_SHADOW1D_ARRAY ||
- target == TGSI_TEXTURE_SHADOW2D ||
+ target == TGSI_TEXTURE_2D_ARRAY ||
target == TGSI_TEXTURE_SHADOW2D_ARRAY ||
- target == TGSI_TEXTURE_SHADOWCUBE ||
+ target == TGSI_TEXTURE_CUBE_ARRAY ||
target == TGSI_TEXTURE_SHADOWCUBE_ARRAY ||
- target == TGSI_TEXTURE_SHADOWRECT;
+ target == TGSI_TEXTURE_2D_ARRAY_MSAA;
+}
+
+static void set_tex_fetch_args(struct gallivm_state *gallivm,
+ struct lp_build_emit_data *emit_data,
+ unsigned opcode, unsigned target,
+ LLVMValueRef res_ptr, LLVMValueRef samp_ptr,
+ LLVMValueRef *param, unsigned count,
+ unsigned dmask)
+{
+ unsigned num_args;
+ unsigned is_rect = target == TGSI_TEXTURE_RECT;
+ LLVMTypeRef i32 = LLVMInt32TypeInContext(gallivm->context);
+
+ /* Pad to power of two vector */
+ while (count < util_next_power_of_two(count))
+ param[count++] = LLVMGetUndef(i32);
+
+ /* Texture coordinates. */
+ if (count > 1)
+ emit_data->args[0] = lp_build_gather_values(gallivm, param, count);
+ else
+ emit_data->args[0] = param[0];
+
+ /* Resource. */
+ emit_data->args[1] = res_ptr;
+ num_args = 2;
+
+ if (opcode == TGSI_OPCODE_TXF || opcode == TGSI_OPCODE_TXQ)
+ emit_data->dst_type = LLVMVectorType(i32, 4);
+ else {
+ emit_data->dst_type = LLVMVectorType(
+ LLVMFloatTypeInContext(gallivm->context), 4);
+
+ emit_data->args[num_args++] = samp_ptr;
+ }
+
+ emit_data->args[num_args++] = lp_build_const_int32(gallivm, dmask);
+ emit_data->args[num_args++] = lp_build_const_int32(gallivm, is_rect); /* unorm */
+ emit_data->args[num_args++] = lp_build_const_int32(gallivm, 0); /* r128 */
+ emit_data->args[num_args++] = lp_build_const_int32(gallivm,
+ tgsi_is_array_sampler(target)); /* da */
+ emit_data->args[num_args++] = lp_build_const_int32(gallivm, 0); /* glc */
+ emit_data->args[num_args++] = lp_build_const_int32(gallivm, 0); /* slc */
+ emit_data->args[num_args++] = lp_build_const_int32(gallivm, 0); /* tfe */
+ emit_data->args[num_args++] = lp_build_const_int32(gallivm, 0); /* lwe */
+
+ emit_data->arg_count = num_args;
}
static const struct lp_build_tgsi_action tex_action;
{
struct si_shader_context *si_shader_ctx = si_shader_context(bld_base);
struct gallivm_state *gallivm = bld_base->base.gallivm;
+ LLVMBuilderRef builder = gallivm->builder;
const struct tgsi_full_instruction * inst = emit_data->inst;
unsigned opcode = inst->Instruction.Opcode;
unsigned target = inst->Texture.Texture;
unsigned num_deriv_channels = 0;
bool has_offset = inst->Texture.NumOffsets > 0;
LLVMValueRef res_ptr, samp_ptr, fmask_ptr = NULL;
+ LLVMTypeRef i32 = LLVMInt32TypeInContext(gallivm->context);
+ unsigned dmask = 0xf;
sampler_src = emit_data->inst->Instruction.NumSrcRegs - 1;
sampler_index = emit_data->inst->Src[sampler_src].Register.Index;
fmask_ptr = si_shader_ctx->resources[SI_FMASK_TEX_OFFSET + sampler_index];
}
+ if (opcode == TGSI_OPCODE_TXQ) {
+ if (target == TGSI_TEXTURE_BUFFER) {
+ LLVMTypeRef v8i32 = LLVMVectorType(i32, 8);
+
+ /* Read the size from the buffer descriptor directly. */
+ LLVMValueRef res = LLVMBuildBitCast(builder, res_ptr, v8i32, "");
+ LLVMValueRef size = LLVMBuildExtractElement(builder, res,
+ lp_build_const_int32(gallivm, 6), "");
+
+ if (si_shader_ctx->screen->b.chip_class >= VI) {
+ /* On VI, the descriptor contains the size in bytes,
+ * but TXQ must return the size in elements.
+ * The stride is always non-zero for resources using TXQ.
+ */
+ LLVMValueRef stride =
+ LLVMBuildExtractElement(builder, res,
+ lp_build_const_int32(gallivm, 5), "");
+ stride = LLVMBuildLShr(builder, stride,
+ lp_build_const_int32(gallivm, 16), "");
+ stride = LLVMBuildAnd(builder, stride,
+ lp_build_const_int32(gallivm, 0x3FFF), "");
+
+ size = LLVMBuildUDiv(builder, size, stride, "");
+ }
+
+ emit_data->args[0] = size;
+ return;
+ }
+
+ /* Textures - set the mip level. */
+ address[count++] = lp_build_emit_fetch(bld_base, inst, 0, TGSI_CHAN_X);
+
+ set_tex_fetch_args(gallivm, emit_data, opcode, target, res_ptr,
+ NULL, address, count, 0xf);
+ return;
+ }
+
if (target == TGSI_TEXTURE_BUFFER) {
LLVMTypeRef i128 = LLVMIntTypeInContext(gallivm->context, 128);
LLVMTypeRef v2i128 = LLVMVectorType(i128, 2);
address[count++] = lp_build_emit_fetch(bld_base, inst, 1, 0);
/* Pack depth comparison value */
- if (tgsi_is_shadow_sampler(target) && opcode != TGSI_OPCODE_LODQ) {
+ if (tgsi_is_shadow_target(target) && opcode != TGSI_OPCODE_LODQ) {
if (target == TGSI_TEXTURE_SHADOWCUBE_ARRAY) {
address[count++] = lp_build_emit_fetch(bld_base, inst, 1, 0);
} else {
for (chan = 0; chan < count; chan++ ) {
address[chan] = LLVMBuildBitCast(gallivm->builder,
- address[chan],
- LLVMInt32TypeInContext(gallivm->context),
- "");
+ address[chan], i32, "");
}
/* Adjust the sample index according to FMASK.
}
txf_address[3] = bld_base->uint_bld.zero;
- /* Pad to a power-of-two size. */
- while (txf_count < util_next_power_of_two(txf_count))
- txf_address[txf_count++] = LLVMGetUndef(LLVMInt32TypeInContext(gallivm->context));
-
/* Read FMASK using TXF. */
inst.Instruction.Opcode = TGSI_OPCODE_TXF;
- inst.Texture.Texture = target == TGSI_TEXTURE_2D_MSAA ? TGSI_TEXTURE_2D : TGSI_TEXTURE_2D_ARRAY;
+ inst.Texture.Texture = target;
txf_emit_data.inst = &inst;
txf_emit_data.chan = 0;
- txf_emit_data.dst_type = LLVMVectorType(
- LLVMInt32TypeInContext(gallivm->context), 4);
- txf_emit_data.args[0] = lp_build_gather_values(gallivm, txf_address, txf_count);
- txf_emit_data.args[1] = fmask_ptr;
- txf_emit_data.args[2] = lp_build_const_int32(gallivm, inst.Texture.Texture);
- txf_emit_data.arg_count = 3;
-
+ set_tex_fetch_args(gallivm, &txf_emit_data, TGSI_OPCODE_TXF,
+ target, fmask_ptr, NULL,
+ txf_address, txf_count, 0xf);
build_tex_intrinsic(&tex_action, bld_base, &txf_emit_data);
/* Initialize some constants. */
final_sample, address[sample_chan], "");
}
- /* Resource */
- emit_data->args[1] = res_ptr;
-
if (opcode == TGSI_OPCODE_TXF) {
/* add tex offsets */
if (inst->Texture.NumOffsets) {
/* texture offsets do not apply to other texture targets */
}
}
+ }
- emit_data->args[2] = lp_build_const_int32(gallivm, target);
- emit_data->arg_count = 3;
-
- emit_data->dst_type = LLVMVectorType(
- LLVMInt32TypeInContext(gallivm->context),
- 4);
- } else if (opcode == TGSI_OPCODE_TG4 ||
- opcode == TGSI_OPCODE_LODQ ||
- has_offset) {
- unsigned is_array = target == TGSI_TEXTURE_1D_ARRAY ||
- target == TGSI_TEXTURE_SHADOW1D_ARRAY ||
- target == TGSI_TEXTURE_2D_ARRAY ||
- target == TGSI_TEXTURE_SHADOW2D_ARRAY ||
- target == TGSI_TEXTURE_CUBE_ARRAY ||
- target == TGSI_TEXTURE_SHADOWCUBE_ARRAY;
- unsigned is_rect = target == TGSI_TEXTURE_RECT;
- unsigned dmask = 0xf;
-
- if (opcode == TGSI_OPCODE_TG4) {
- unsigned gather_comp = 0;
-
- /* DMASK was repurposed for GATHER4. 4 components are always
- * returned and DMASK works like a swizzle - it selects
- * the component to fetch. The only valid DMASK values are
- * 1=red, 2=green, 4=blue, 8=alpha. (e.g. 1 returns
- * (red,red,red,red) etc.) The ISA document doesn't mention
- * this.
- */
+ if (opcode == TGSI_OPCODE_TG4) {
+ unsigned gather_comp = 0;
- /* Get the component index from src1.x for Gather4. */
- if (!tgsi_is_shadow_sampler(target)) {
- LLVMValueRef (*imms)[4] = lp_soa_context(bld_base)->immediates;
- LLVMValueRef comp_imm;
- struct tgsi_src_register src1 = inst->Src[1].Register;
+ /* DMASK was repurposed for GATHER4. 4 components are always
+ * returned and DMASK works like a swizzle - it selects
+ * the component to fetch. The only valid DMASK values are
+ * 1=red, 2=green, 4=blue, 8=alpha. (e.g. 1 returns
+ * (red,red,red,red) etc.) The ISA document doesn't mention
+ * this.
+ */
- assert(src1.File == TGSI_FILE_IMMEDIATE);
+ /* Get the component index from src1.x for Gather4. */
+ if (!tgsi_is_shadow_target(target)) {
+ LLVMValueRef (*imms)[4] = lp_soa_context(bld_base)->immediates;
+ LLVMValueRef comp_imm;
+ struct tgsi_src_register src1 = inst->Src[1].Register;
- comp_imm = imms[src1.Index][src1.SwizzleX];
- gather_comp = LLVMConstIntGetZExtValue(comp_imm);
- gather_comp = CLAMP(gather_comp, 0, 3);
- }
+ assert(src1.File == TGSI_FILE_IMMEDIATE);
- dmask = 1 << gather_comp;
+ comp_imm = imms[src1.Index][src1.SwizzleX];
+ gather_comp = LLVMConstIntGetZExtValue(comp_imm);
+ gather_comp = CLAMP(gather_comp, 0, 3);
}
- emit_data->args[2] = samp_ptr;
- emit_data->args[3] = lp_build_const_int32(gallivm, dmask);
- emit_data->args[4] = lp_build_const_int32(gallivm, is_rect); /* unorm */
- emit_data->args[5] = lp_build_const_int32(gallivm, 0); /* r128 */
- emit_data->args[6] = lp_build_const_int32(gallivm, is_array); /* da */
- emit_data->args[7] = lp_build_const_int32(gallivm, 0); /* glc */
- emit_data->args[8] = lp_build_const_int32(gallivm, 0); /* slc */
- emit_data->args[9] = lp_build_const_int32(gallivm, 0); /* tfe */
- emit_data->args[10] = lp_build_const_int32(gallivm, 0); /* lwe */
-
- emit_data->arg_count = 11;
-
- emit_data->dst_type = LLVMVectorType(
- LLVMFloatTypeInContext(gallivm->context),
- 4);
- } else {
- emit_data->args[2] = samp_ptr;
- emit_data->args[3] = lp_build_const_int32(gallivm, target);
- emit_data->arg_count = 4;
-
- emit_data->dst_type = LLVMVectorType(
- LLVMFloatTypeInContext(gallivm->context),
- 4);
+ dmask = 1 << gather_comp;
}
- /* The fetch opcode has been converted to a 2D array fetch.
- * This simplifies the LLVM backend. */
- if (target == TGSI_TEXTURE_CUBE_ARRAY)
- target = TGSI_TEXTURE_2D_ARRAY;
- else if (target == TGSI_TEXTURE_SHADOWCUBE_ARRAY)
- target = TGSI_TEXTURE_SHADOW2D_ARRAY;
-
- /* Pad to power of two vector */
- while (count < util_next_power_of_two(count))
- address[count++] = LLVMGetUndef(LLVMInt32TypeInContext(gallivm->context));
-
- emit_data->args[0] = lp_build_gather_values(gallivm, address, count);
+ set_tex_fetch_args(gallivm, emit_data, opcode, target, res_ptr,
+ samp_ptr, address, count, dmask);
}
static void build_tex_intrinsic(const struct lp_build_tgsi_action * action,
unsigned target = emit_data->inst->Texture.Texture;
char intr_name[127];
bool has_offset = emit_data->inst->Texture.NumOffsets > 0;
+ bool is_shadow = tgsi_is_shadow_target(target);
+ char type[64];
+ const char *name = "llvm.SI.image.sample";
+ const char *infix = "";
+
+ if (opcode == TGSI_OPCODE_TXQ && target == TGSI_TEXTURE_BUFFER) {
+ /* Just return the buffer size. */
+ emit_data->output[emit_data->chan] = emit_data->args[0];
+ return;
+ }
if (target == TGSI_TEXTURE_BUFFER) {
emit_data->output[emit_data->chan] = lp_build_intrinsic(
return;
}
- if (opcode == TGSI_OPCODE_TG4 ||
- opcode == TGSI_OPCODE_LODQ ||
- (opcode != TGSI_OPCODE_TXF && has_offset)) {
- bool is_shadow = tgsi_is_shadow_sampler(target);
- const char *name = "llvm.SI.image.sample";
- const char *infix = "";
-
- switch (opcode) {
- case TGSI_OPCODE_TEX:
- case TGSI_OPCODE_TEX2:
- case TGSI_OPCODE_TXP:
- break;
- case TGSI_OPCODE_TXB:
- case TGSI_OPCODE_TXB2:
- infix = ".b";
- break;
- case TGSI_OPCODE_TXL:
- case TGSI_OPCODE_TXL2:
- infix = ".l";
- break;
- case TGSI_OPCODE_TXD:
- infix = ".d";
- break;
- case TGSI_OPCODE_TG4:
- name = "llvm.SI.gather4";
- break;
- case TGSI_OPCODE_LODQ:
- name = "llvm.SI.getlod";
- is_shadow = false;
- has_offset = false;
- break;
- default:
- assert(0);
- return;
- }
-
- /* Add the type and suffixes .c, .o if needed. */
- sprintf(intr_name, "%s%s%s%s.v%ui32", name,
- is_shadow ? ".c" : "", infix, has_offset ? ".o" : "",
- LLVMGetVectorSize(LLVMTypeOf(emit_data->args[0])));
-
- emit_data->output[emit_data->chan] = lp_build_intrinsic(
- base->gallivm->builder, intr_name, emit_data->dst_type,
- emit_data->args, emit_data->arg_count,
- LLVMReadNoneAttribute | LLVMNoUnwindAttribute);
- } else {
- LLVMTypeRef i8, v16i8, v32i8;
- const char *name;
-
- switch (opcode) {
- case TGSI_OPCODE_TEX:
- case TGSI_OPCODE_TEX2:
- case TGSI_OPCODE_TXP:
- name = "llvm.SI.sample";
- break;
- case TGSI_OPCODE_TXB:
- case TGSI_OPCODE_TXB2:
- name = "llvm.SI.sampleb";
- break;
- case TGSI_OPCODE_TXD:
- name = "llvm.SI.sampled";
- break;
- case TGSI_OPCODE_TXF:
- name = "llvm.SI.imageload";
- break;
- case TGSI_OPCODE_TXL:
- case TGSI_OPCODE_TXL2:
- name = "llvm.SI.samplel";
- break;
- default:
- assert(0);
- return;
- }
-
- i8 = LLVMInt8TypeInContext(base->gallivm->context);
- v16i8 = LLVMVectorType(i8, 16);
- v32i8 = LLVMVectorType(i8, 32);
-
- emit_data->args[1] = LLVMBuildBitCast(base->gallivm->builder,
- emit_data->args[1], v32i8, "");
- if (opcode != TGSI_OPCODE_TXF) {
- emit_data->args[2] = LLVMBuildBitCast(base->gallivm->builder,
- emit_data->args[2], v16i8, "");
- }
-
- sprintf(intr_name, "%s.v%ui32", name,
- LLVMGetVectorSize(LLVMTypeOf(emit_data->args[0])));
-
- emit_data->output[emit_data->chan] = lp_build_intrinsic(
- base->gallivm->builder, intr_name, emit_data->dst_type,
- emit_data->args, emit_data->arg_count,
- LLVMReadNoneAttribute | LLVMNoUnwindAttribute);
- }
-}
-
-static void txq_fetch_args(
- struct lp_build_tgsi_context * bld_base,
- struct lp_build_emit_data * emit_data)
-{
- struct si_shader_context *si_shader_ctx = si_shader_context(bld_base);
- const struct tgsi_full_instruction *inst = emit_data->inst;
- struct gallivm_state *gallivm = bld_base->base.gallivm;
- LLVMBuilderRef builder = gallivm->builder;
- unsigned target = inst->Texture.Texture;
- LLVMValueRef res_ptr;
-
- if (inst->Src[1].Register.Indirect) {
- const struct tgsi_full_src_register *reg = &inst->Src[1];
- LLVMValueRef ind_index;
-
- ind_index = get_indirect_index(si_shader_ctx, ®->Indirect, reg->Register.Index);
-
- res_ptr = LLVMGetParam(si_shader_ctx->radeon_bld.main_fn, SI_PARAM_RESOURCE);
- res_ptr = build_indexed_load_const(si_shader_ctx, res_ptr,
- ind_index);
- } else
- res_ptr = si_shader_ctx->resources[inst->Src[1].Register.Index];
-
- if (target == TGSI_TEXTURE_BUFFER) {
- LLVMTypeRef i32 = LLVMInt32TypeInContext(gallivm->context);
- LLVMTypeRef v8i32 = LLVMVectorType(i32, 8);
-
- /* Read the size from the buffer descriptor directly. */
- LLVMValueRef res = LLVMBuildBitCast(builder, res_ptr, v8i32, "");
- LLVMValueRef size = LLVMBuildExtractElement(builder, res,
- lp_build_const_int32(gallivm, 6), "");
-
- if (si_shader_ctx->screen->b.chip_class >= VI) {
- /* On VI, the descriptor contains the size in bytes,
- * but TXQ must return the size in elements.
- * The stride is always non-zero for resources using TXQ.
- */
- LLVMValueRef stride =
- LLVMBuildExtractElement(builder, res,
- lp_build_const_int32(gallivm, 5), "");
- stride = LLVMBuildLShr(builder, stride,
- lp_build_const_int32(gallivm, 16), "");
- stride = LLVMBuildAnd(builder, stride,
- lp_build_const_int32(gallivm, 0x3FFF), "");
-
- size = LLVMBuildUDiv(builder, size, stride, "");
- }
-
- emit_data->args[0] = size;
+ switch (opcode) {
+ case TGSI_OPCODE_TXF:
+ name = target == TGSI_TEXTURE_2D_MSAA ||
+ target == TGSI_TEXTURE_2D_ARRAY_MSAA ?
+ "llvm.SI.image.load" :
+ "llvm.SI.image.load.mip";
+ is_shadow = false;
+ has_offset = false;
+ break;
+ case TGSI_OPCODE_TXQ:
+ name = "llvm.SI.getresinfo";
+ is_shadow = false;
+ has_offset = false;
+ break;
+ case TGSI_OPCODE_LODQ:
+ name = "llvm.SI.getlod";
+ is_shadow = false;
+ has_offset = false;
+ break;
+ case TGSI_OPCODE_TEX:
+ case TGSI_OPCODE_TEX2:
+ case TGSI_OPCODE_TXP:
+ break;
+ case TGSI_OPCODE_TXB:
+ case TGSI_OPCODE_TXB2:
+ infix = ".b";
+ break;
+ case TGSI_OPCODE_TXL:
+ case TGSI_OPCODE_TXL2:
+ infix = ".l";
+ break;
+ case TGSI_OPCODE_TXD:
+ infix = ".d";
+ break;
+ case TGSI_OPCODE_TG4:
+ name = "llvm.SI.gather4";
+ break;
+ default:
+ assert(0);
return;
}
- /* Mip level */
- emit_data->args[0] = lp_build_emit_fetch(bld_base, inst, 0, TGSI_CHAN_X);
-
- /* Resource */
- emit_data->args[1] = res_ptr;
-
- /* Texture target */
- if (target == TGSI_TEXTURE_CUBE_ARRAY ||
- target == TGSI_TEXTURE_SHADOWCUBE_ARRAY)
- target = TGSI_TEXTURE_2D_ARRAY;
-
- emit_data->args[2] = lp_build_const_int32(bld_base->base.gallivm,
- target);
-
- emit_data->arg_count = 3;
-
- emit_data->dst_type = LLVMVectorType(
- LLVMInt32TypeInContext(bld_base->base.gallivm->context),
- 4);
-}
-
-static void build_txq_intrinsic(const struct lp_build_tgsi_action * action,
- struct lp_build_tgsi_context * bld_base,
- struct lp_build_emit_data * emit_data)
-{
- unsigned target = emit_data->inst->Texture.Texture;
+ if (LLVMGetTypeKind(LLVMTypeOf(emit_data->args[0])) == LLVMVectorTypeKind)
+ sprintf(type, ".v%ui32",
+ LLVMGetVectorSize(LLVMTypeOf(emit_data->args[0])));
+ else
+ strcpy(type, ".i32");
- if (target == TGSI_TEXTURE_BUFFER) {
- /* Just return the buffer size. */
- emit_data->output[emit_data->chan] = emit_data->args[0];
- return;
- }
+ /* Add the type and suffixes .c, .o if needed. */
+ sprintf(intr_name, "%s%s%s%s%s",
+ name, is_shadow ? ".c" : "", infix,
+ has_offset ? ".o" : "", type);
- build_tgsi_intrinsic_nomem(action, bld_base, emit_data);
+ emit_data->output[emit_data->chan] = lp_build_intrinsic(
+ base->gallivm->builder, intr_name, emit_data->dst_type,
+ emit_data->args, emit_data->arg_count,
+ LLVMReadNoneAttribute | LLVMNoUnwindAttribute);
/* Divide the number of layers by 6 to get the number of cubes. */
- if (target == TGSI_TEXTURE_CUBE_ARRAY ||
- target == TGSI_TEXTURE_SHADOWCUBE_ARRAY) {
+ if (opcode == TGSI_OPCODE_TXQ &&
+ (target == TGSI_TEXTURE_CUBE_ARRAY ||
+ target == TGSI_TEXTURE_SHADOWCUBE_ARRAY)) {
LLVMBuilderRef builder = bld_base->base.gallivm->builder;
LLVMValueRef two = lp_build_const_int32(bld_base->base.gallivm, 2);
LLVMValueRef six = lp_build_const_int32(bld_base->base.gallivm, 6);
.emit = build_tex_intrinsic,
};
-static const struct lp_build_tgsi_action txq_action = {
- .fetch_args = txq_fetch_args,
- .emit = build_txq_intrinsic,
- .intr_name = "llvm.SI.resinfo"
-};
-
static const struct lp_build_tgsi_action interp_action = {
.fetch_args = interp_fetch_args,
.emit = build_interp_intrinsic,
bld_base->op_actions[TGSI_OPCODE_TXL] = tex_action;
bld_base->op_actions[TGSI_OPCODE_TXL2] = tex_action;
bld_base->op_actions[TGSI_OPCODE_TXP] = tex_action;
- bld_base->op_actions[TGSI_OPCODE_TXQ] = txq_action;
+ bld_base->op_actions[TGSI_OPCODE_TXQ] = tex_action;
bld_base->op_actions[TGSI_OPCODE_TG4] = tex_action;
bld_base->op_actions[TGSI_OPCODE_LODQ] = tex_action;
projects / platform / upstream / mesa.git / commitdiff